setting default file location with NavCreateGetFileDialog

[shannen]

Hi,
I was trying to set the default file location using the NavCreateGetFileDialog but failed. The following is what I have done. Please advice and thank you very much.

The call is:

code:

OSStatus theErr = ::NavCreateGetFileDialog( &theDialogOptions, theTypes, DialogCallback, NULL, OpenFileFilterCallback, this, &m_DialogBox );

The functions are as follows
pascal void CFileOpenDialog:ialogCallback( NavEventCallbackMessage inCallbackSelector, NavCBRecPtr inCallbackParms, void* inCallbackUD )
{
CFileOpenDialog* theDialog = static_cast<CFileOpenDialog*>( inCallbackUD );

theDialog->HandleCallback( inCallbackSelector, inCallbackParms );
}

void CFileOpenDialog::HandleCallback( NavEventCallbackMessage inCallbackSelector, NavCBRecPtr inCallbackParms )
{
if ( inCallbackParms )
inCallbackParms = NULL;

switch( inCallbackSelector)
{
case kNavCBStart:
{
if ( m_StartLocation.GetAbsolutePath( ) != "" )
{
//AEStorageDataType theStorage;
AEDesc theLocation = { typeNull, NULL };

FSSpec theFSSpec = m_StartLocation.GetFSSpec( );

OSStatus theStatus = ::AECreateDesc( typeFSS, &theFSSpec, sizeof(FSSpec), &theLocation );

if ( theStatus == noErr )
theStatus = ::NavCustomControl( m_DialogBox, kNavCtlSetLocation, (void*)&theLocation);

}
}
break;
}
}


fyi: the last statement (theStatus = .....) returns me an error code of -50. Appreciate for all help render. Thanks